Emoji Telepathy is a game where you try to hone-in on a single emoji with another player. Both players have to pick an emoji at the same time, and can't pick emojis previously picked - meaning you have to predict what your partner will choose!
It was made for the Hack Club High Seas event, and is designed to run in serverless environments.
If there are no players online, after some time, the match-making system will automagically create a bot player for you. The bot uses a simple algorithm to try and predict what you'll choose next! You can see how it works here.